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Modelling of machining of Ti-6AI-4V titanium Alloy using a constitutive model accounting for the state of stress in the deformation zone

Abstract : The aim of this thesis is to propose a constitutive model of Ti-6Al-4V titanium alloy and apply it to the metal cutting simulation. This constitutive model includes the most relevant parameters affecting the mechanical behavior (plasticity and damage) of Ti-6Al-4V titanium alloy in metal cutting (i.e. the state of stress and the strain-rate). Special specimens were designed to generate a wide range of states of stress (i.e. triaxiality and Lode angle) in mechanical testing, which are representative of the metal cutting process. An optimization-based procedure was developed to determine the coefficients of the constitutive model with high accuracy. The accuracy of the proposed constitutive model to describe the mechanical behavior of Ti-6Al-4V alloy under different states of stress was confirmed by comparing the experimental and simulated results of the mechanical tests. Finally, orthogonal cutting and turning models of Ti-6Al-4V including the proposed constitutive model were developed and applied to predict the forces, temperatures, chip geometry and the surface integrity in the machined surface and subsurface. The accuracy of these machining models was evaluated by comparing the simulated and experimental results.
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Submitted on : Friday, June 25, 2021 - 10:58:49 AM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM
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  • HAL Id : tel-03270833, version 1

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Wenyu Cheng. Modelling of machining of Ti-6AI-4V titanium Alloy using a constitutive model accounting for the state of stress in the deformation zone. Other [cond-mat.other]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2019. English. ⟨NNT : 2019ENAM0055⟩. ⟨tel-03270833⟩

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